fix NPE: redisplay() before readLine()

jline · Apr 29, 2019 · 4683d8e · 4683d8e
1 parent d862e3e
commit 4683d8e
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Showing 2 changed files with 23 additions and 16 deletions.
diff --git a/builtins/src/test/java/org/jline/example/Example.java b/builtins/src/test/java/org/jline/example/Example.java
@@ -151,11 +151,11 @@ public static void main(String[] args) throws IOException {
                                 int counter = 0;
                                 while (true) {
                                     try {
-                                        Thread.sleep(1000);
                                         Status status = Status.getStatus(reader.getTerminal());
                                         counter++;
                                         status.update(Arrays.asList(new AttributedStringBuilder().append("counter: " + counter).toAttributedString()));
                                         ((LineReaderImpl) reader).redisplay();
+                                        Thread.sleep(1000);
                                     } catch (InterruptedException e) {
                                         e.printStackTrace();
                                     }
@@ -297,7 +297,9 @@ public void complete(LineReader reader, ParsedLine line, List<Candidate> candida
                 }
             }
             callbacks.forEach(c -> c.accept(reader));
-
+            if (!callbacks.isEmpty()) {
+                Thread.sleep(2000);
+            }
             while (true) {
                 String line = null;
                 try {

diff --git a/reader/src/main/java/org/jline/reader/impl/LineReaderImpl.java b/reader/src/main/java/org/jline/reader/impl/LineReaderImpl.java
@@ -163,8 +163,8 @@ protected enum BellType {
 
     protected final Size size = new Size();
 
-    protected AttributedString prompt;
-    protected AttributedString rightPrompt;
+    protected AttributedString prompt = AttributedString.EMPTY;
+    protected AttributedString rightPrompt = AttributedString.EMPTY;
 
     protected MaskingCallback maskingCallback;
 
@@ -279,6 +279,7 @@ public LineReaderImpl(Terminal terminal, String appName, Map<String, Object> var
         builtinWidgets = builtinWidgets();
         widgets = new HashMap<>(builtinWidgets);
         bindingReader = new BindingReader(terminal.reader());
+        doDisplay();
     }
 
     public Terminal getTerminal() {
@@ -537,18 +538,7 @@ public String readLine(String prompt, String rightPrompt, MaskingCallback maskin
                 previousContHandler = terminal.handle(Signal.CONT, this::handleSignal);
                 originalAttributes = terminal.enterRawMode();
 
-                // Cache terminal size for the duration of the call to readLine()
-                // It will eventually be updated with WINCH signals
-                size.copy(terminal.getBufferSize());
-
-                display = new Display(terminal, false);
-                if (size.getRows() == 0 || size.getColumns() == 0) {
-                    display.resize(1, Integer.MAX_VALUE);
-                } else {
-                    display.resize(size.getRows(), size.getColumns());
-                }
-                if (isSet(Option.DELAY_LINE_WRAP))
-                    display.setDelayLineWrap(true);
+                doDisplay();
 
                 // Move into application mode
                 if (!dumb) {
@@ -676,6 +666,21 @@ public String readLine(String prompt, String rightPrompt, MaskingCallback maskin
         }
     }
 
+    private void doDisplay(){
+        // Cache terminal size for the duration of the call to readLine()
+        // It will eventually be updated with WINCH signals
+        size.copy(terminal.getBufferSize());
+
+        display = new Display(terminal, false);
+        if (size.getRows() == 0 || size.getColumns() == 0) {
+            display.resize(1, Integer.MAX_VALUE);
+        } else {
+            display.resize(size.getRows(), size.getColumns());
+        }
+        if (isSet(Option.DELAY_LINE_WRAP))
+            display.setDelayLineWrap(true);
+    }
+
     @Override
     public void printAbove(String str) {
         try {